| City | County | 2026 Pop. ↓ |
|---|---|---|
| Oakdale | Washington County | 31,103 |
| Owatonna | Steele County | 26,689 |
| Otsego | Wright County | 25,454 |
| Oak Grove | Anoka County | 9,577 |
| Orono | Carver County | 8,288 |
| Oak Park Heights | Washington County | 4,568 |
| Osseo | Hennepin County | 2,499 |
| Olivia | Renville County | 2,275 |
| Oronoco | Olmsted County | 2,098 |
| Ortonville | Big Stone County | 1,955 |
| Osakis | Douglas County | 1,732 |
| Onamia | Mille Lacs County | 852 |
| Ottertail | Otter Tail County | 754 |
| Oklee | Red Lake County | 415 |
| Ogilvie | Kanabec County | 397 |
| Oslo | Marshall County | 238 |
| Ostrander | Fillmore County | 222 |
| Orr | St. Louis County | 209 |
| Osage | Becker County | 204 |
| Ogema | Becker County | 199 |
| Okabena | Jackson County | 197 |
| Odin | Watonwan County | 127 |
| Ormsby | Martin County | 122 |
| Odessa | Big Stone County | 101 |